| 摘要 |
PURPOSE:To enlarge a repeating interval and to reduce the cost of an entire system in an optical amplifying relay system. CONSTITUTION:It is necessary for the optical amplifying relay system to match a signal wavelength with a zero distribution wavelength in order to avoid the influence of the distribution of optical fibers. When a repeating output is increased more than +5dBm in the transmission using these optical fibers, however, transmission characteristics are degraded by non-linear effects inside the optical fibers being the transmission lines. Therefore, the output of the relay amplifier is limited and as a result, it is necessary to shorten the repeating interval. In order to avoid the non-linear effects inside these optical fibers, the distributed values of fibers 101, 111, 121, 131...191 for transmission are set excepting for zero for each relay block, and optical fibers 102, 112, 122, 132...192 are inserted for compensating the wavelength distribution of these fibers for transmission. Thus, an optical multistage relay system not to degrade the transmission characteristic even by the high repeater output about +10dBm can be constructed. |
